Exploring the Singlino-dominated Thermal Neutralino Dark Matter in the $Z_3$ invariant NMSSM

TL;DR

This paper investigates Singlino-dominated neutralino dark matter within the NMSSM, analyzing its relic abundance, dominant annihilation modes, and prospects for detection at the HL-LHC through triple-boson final states.

Contribution

It provides a comprehensive parameter space analysis of Singlino-dominated neutralino dark matter, including relic density constraints, dominant annihilation channels, and collider signatures at the HL-LHC.

Findings

Identified parameter regions with correct relic abundance and experimental constraints.

Determined dominant annihilation modes for various LSP mass ranges.

Assessed the detectability of triple-boson final states at the HL-LHC.

Abstract

We examine the parameter space of the Next to Minimal Supersymmetric Standard Model (NMSSM) with Singlino-dominated neutralino $\widetilde\chi_1^0$ as the lightest supersymmetric particle (LSP). Our study focuses on identifying the regions within this parameter space that produce a thermal relic abundance of $\widetilde\chi_1^0$ smaller than the observed cold dark matter relic density while remaining consistent with constraints from LEP measurements, low-energy experiments, Higgs measurements, LHC data, and dark matter direct detection experiments. We identify the dominant annihilation modes of the LSP neutralino across varying LSP mass ranges $\sim \mathcal{O}(1)-\mathcal{O}(10^{3})~$GeV. Furthermore, we conduct a benchmark study to assess the production rates of triple-boson final states emerging from direct electroweakino pair production at the LHC. Drawing insights from these findings, we perform a detailed collider analysis to explore the future potential of probing the triple-boson final states involving a light Higgs boson at the high-luminosity LHC (HL-LHC).